Recent content by M P

Homework Statement Homework EquationsThe Attempt at a Solution Process actual at 300 Transmitter range 100 - 420 Output 4 - 20mA Output Actual 15.43mA Conditional output 3.85 PV and SP at 300 Valve position at 30% Anyone can help if I am on a right track? I am not sure how to start...

Sorry but I draw it in paint...:sorry:

Thank you guys for all your help!

Unless is something to do with R1?

Not sure to be honest goes to voltage regulator?

it goes towards TR1

TR2 will kick in and regulate the current..

hello guys again and thanks for helping me.. I was reading stuff about LM79XX features like berkeman advised and read something might fit this situation... TR2 perhaps reduce the difference between input and output. greater the difference more power is dissipated in the regulator so it gets hot??

I did not understand the first bit and you are saying we need to rise input to 10V. Would not that give 9.5V at R2? From clues of CWatters I think TR1 is a transistor pass and TR2 protects the circuit from self damage.

Thank you for your answer CWatters! "SOA is defined as the voltage and current conditions over which the device can be expected to operate without self-damage" So TR2 protects the circuit by the sound of it?

So the volt drop should turn those TR1 and TR2 ??

That is what I think you were saying right?

Thanks berkeman tha you not giving upon me So we have 6.5V and that need to be rectified by TR2?

All I thought is those TR 1 and 2 are transistors pass switched on by a drops from R1 and R2.

Small current flows through?:confused: